Gas-operated air-heating device



March 18, 1930. c5. DUYCART 1,751,399

GAS OPERATED AIR HEATING DEVICE Filed May 31, 1927 2 Sheets-Sheet 1 o ua o v J a l9 Patented Mar. 18, 1930 UNITED STATES,

PATENT. OFFICE V GUILLAU E DUCABT, or PARIS, FRANCE GAS-OPERATEDIR-HEATIN DEVICE Application filed May 31, 192.7,.Seria1 No, 195,520,andin France June 4, 1926.

The present invention relates to a gas operated air heater moreparticularly adapted heated is in direct contact with the heating gasfor which it serves as burning agent, a

consequence of which is that the air which is employed for drying is notpurebut is mixed with burnt gas, which vitiates the atmos-' phere of therooms in which these appliances vantage is further accentuated by thefact that the circulation of the air is obtained by meansof a suction orpressure fan and that, as a consequence of the speed of'the an to bedried, the gas is burned under unfavourable conditions and a part of thegas is carried along by the air without being burned.

The object of the present invention is to remove the above mentioneddrawbacks ex isting in a present day apparatus of this type and withthis object in view it has for its object a gas operated air heatercharacterized by the feature that the air is heated without being placedat any moment in contact with the burning gases, a'fact which presentsthe advantage of giving a supply of absolutely pure hot air. Theapparatus 4 subject of the invention is hereinafter depanying drawingsin which:

Fig. 1 is a front elevation of the apparatus. v

a view to maintaining this temperature; This Fig. 2 is a side elevation.

Fig. 3 is a longitudinal section taken along the line wm in Fig. 4.

Fig. 4 is a cross section along the line g z in Fig. 3 and Fig. 5 is across section taken along the line 2-2 in Fig. 3. In these figu es 1 rpresents two elem ts through the walls of the shells l.

scribed in detail with reference to the accomor shells which by beingjoined or combined with a casing or cover 2 make it' possible toconstruct in a simple manner ducts or channels for the air to be heatedon the one hand, and for the hot burnt gases onthe other, without thesefluids becoming mixed with each other. For this purpose'each'ishell 1comprises internal walls or fins 3 and also external wallsor fins 4"preferably formed on the shells by casting. By joining together twoshells 1, the fins 3 being placed'end to end, there is obtainedaninternal'partition arrangement forming ducts 5for the circuare employedand makes it practically im* i 11 Ofthe 'be eate ic is d 15 possible touse a large number of pieces of" apparatus in the same room. Thisdisadmittedinto the apparatus from a fresh air" pipe through an .inletnozzle Gand is" discharged through an outlet nozzle 7 'into'a hot airduct or directly into the consuming .de

vice, the arrows a indicating the'direction of flow of the air tobe'heatedj Theshells 1, thus joined together'may be united by anysuitable means, holesbeing provided for example for taking bolts. The

whole arrangement is enclosedby thecasing or cover 2 withtheinterposition betweenthe said casing and the's'hell 1 of sheets ofasbestos or otherh-eat resisting-body, the

outer fins 4: then bounding the ducts '10 for the v hot burnt gases theheat from which isconv veyed to the air to beheated by conduction Thelighting gas or other gasified is led into the'heating burnersll whichare two in number each disposed outsideof one of the shellsl, to whichburners itisled" through tubes 12 a'nd 13, the delivery being regulatedby a thermo-regulator apparatus "or "thermostat 14 which is .fed withgas through a pipe 15 and the function [of which, when a predeterminedtemperature hasbeen reached, 'is to cut off the'no'rmal-suppl'yj'of gasand leave only a pilot'jet ignited with filed of even date; this type ofthermostat essentially comprises a thermometric inernb'er lodged in acasing and having. a lower coifi i 'm of e pansiqn than' 'helatt r, as

difference in capacity for expansion being employed to make thethermometric member actuate a valve controlling the admission of gas.

In order to house a thermometrical mem her and its casing of theconstruction shown in my copending application herein referred to, thereare provided in adjacent faces of each of the shells 1 vertical groovesof semicircular cross section 16 and 16 so that when the two shells arearranged together :two circular channels 17 and 17' are formed, only oneof which is utilized at a'time for accom modating the tube 21 and therod 22. Accordingly as the temperature of "the shells 1 increases thetube 21 expands while the therinometrical rod 22 expands at the same:time. The expansion of the rod is much less than that of the tube 21and moreover being sub- 'j ected to the action of the spring, not shown,

it ten ds-to bear constantly against the base of the tube 21 it followsthe displacements of the tube 21 and these displacements are utilizedfor regulating and checking the .arrival of the gas in the burners 11 as:clearly [described in my eco-pending application 1795,-

T5l'9 filed May 31, 19.27.. Theair for the Combust'ion of "the gasisrled .to the burners ,11 through perforations 1,8 in the casing 2 andalso through windows 19 formed in (the easing '2 .and through which theair enters as indicated by the arrows b. The burntgases pass along the.ducts .10 and after heating the air 1in the ducts .5 are "dischargedthrough holes 20 without becoming .mixed with'athe hot . This to 'beclearly understood that itiis possible, without going outside the scopeof the invention, to make modifications and ,improvement in details forexample it is possible, .by a udicious arrangement of suitable elements,to .make the .air pass through baflies in the interior of the apparatus.

7h at I vclaim is .1. Altair heaterofetheccharacter described, includinga casing, a pairof identical shells of azheat conducting materialarranged withfin the'icasingandprovided on their adjacent inner faceswith spaced vertical fins which when the shells are .;arranged togetherprovide a series of vertical and parallel passages for (air to beheated, said zshells also provided on ltheirouter surfaceswithia-iseries of ventical fins -.which .coact with the ,=-in-nersurfaces of the side walls .of [the casing v,to

- formpassages through which heated-gas may be passed, the ends of "theshells being-extended beyond the fins and projected through the ends ofthe easing and vforming inlet and outlet air connections, and ,gasburners arranged in the 'lowerpart of the casing heneath the fins venthe outer surfaces of the Shells. v

'2. A device as claimed in claim 1, wherein the casing is providedadjacent the lower combustion of the gases when the burners are ignitedand for allowing the spent gases to pass from the casing, and windowsprovided onitheroutersside walls and adjacent the lower ends of thecasing and the burners.

t. Adev iee-as'claimed in claim 1, wherein the adjacent faces of theshells are provided with grooves which when the shells are securedtogether form passages one of which is adapted to receive aLhBIIDOIHGlJIlCal element.

In testimony whereof I aifix my signature.

GUILLAUME 'DUCART.

